<template>
  <el-breadcrumb class="app-breadcrumb" separator-class="el-icon-arrow-right">
    <transition-group name="breadcrumb" v-if="!isReferCount">
      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
        <span v-if="item.redirect==='noRedirect'||index==levelList.length-1" class="no-redirect" :class="{ last: index === levelList.length - 1 }">{{ item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
    <transition-group name="breadcrumb2" v-else>
      <el-breadcrumb-item :key="1">省平台自产文稿</el-breadcrumb-item>
      <el-breadcrumb-item :key="2">共享稿件管理</el-breadcrumb-item>
      <el-breadcrumb-item :key="3"><span style="color: #1EBC65">文章被引用次数</span></el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
import pathToRegexp from 'path-to-regexp'

export default {
  data() {
    return {
      levelList: null,
      isLast: false
    }
  },
  watch: {
    $route(route) {
      // if you go to the redirect page, do not update the breadcrumbs
      if (route.path.startsWith('/redirect/')) {
        return
      }
      this.getBreadcrumb()
    }
  },
  created() {
    this.getBreadcrumb()
  },
  computed: {
    // 是否是文章被引用次数页面
    isReferCount() {
      return this.$route.path === '/referCount/index';
    }
  },
  methods: {
    getBreadcrumb() {
      // only show routes with meta.title
      let matched = this.$route.matched.filter(item => item.meta && item.meta.title)
      const first = matched[0]

      if (!this.isDashboard(first)) {
        // matched = [{ path: '/index', meta: { title: '首页' }}].concat(matched)
      }

      this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
    },
    isDashboard(route) {
      const name = route && route.name
      if (!name) {
        return false
      }
      return name.trim() === '首页'
    },
    pathCompile(path) {
      const { params } = this.$route
      var toPath = pathToRegexp.compile(path)
      return toPath(params)
    },
    handleLink(item) {
      const { redirect, path } = item
      if (redirect) {
        this.$router.push(redirect)
        return
      }
      this.$router.push(this.pathCompile(path))
    }
  }
}
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 20px;
  .no-redirect {
    color: #666666;
    cursor: text;
  }
  .last {
    color: #1EBC65;
  }
}
</style>
